Port module_partition logic for RRO from Make to Soong

The default partition for RRO is "product/" in Make, but it was
"system/" in Soong. This CL ports the logic from Make to Soong

To implement this, a new function PathForModuleInPartitionInstall is
created that enables callers to provide the relevant partition

Bug: 158407753
Test: from build/soong, ran go test ./java
Change-Id: I05b02eae7fe57189aaad5109c26cccc5823518ef